/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraParameterPanelViewModel.h
[FOnParameterPanelViewModelExternalSelectionChanged](API\Plugins\NiagaraEditor\ViewModels\INiagaraParameterPanelViewModel\FOnParameterPane-) & GetOnExternalSelectionChangedDelegate()